Telephone attachment



. C. BAUM AND E. H. TALBERT.- TELEPHONE ATTACHMENT.

APP/LICATION FILED OCT. 10. 1917.

4 SHEETS-SHEET 1.

Patented Dec. 14,1920. 1

c. BAUM AND E. H. T'ALBERTf TELEPHONE ATTACHMENT. APPLICATION FILED ocr.10. 1917.

1,3 2,4 v Patented Dc. 14,1920.

4 SHEETS-SHEET 2.

we I3 57 1 l) J L512 3 gmento'tz altozneig CfBAUM AND E. HITALBERT.

TELEPHONE ATTACHMENT.

APPLICATION FILED ocT. 10,1917.

Patented Dec.'14, 1920 4 SHEETS-SHEET 3- attozwzg C. BAUM AND'E.H..TALBE RT.

TELEPHONE ATTACHMENT. APPLICATION man OCT. .10. I917.

' Patented Dec.

UNITED STATES PATENT OFFICE.

CHARLES BAUM AND EDGAR H. TALBERT,

SAID TALBERT ASSIGNOR T0 SAID'BAUM.

OF WASHINGTON, DISTRICT COLUMBIA;

TELEPHONE ATTACHMENT.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application filed October 10, 1917. Serial No. 195,773.

To all whom, it may concern:

Be it known that we, CHARLES BAUM and EDGAR H. TALBERT, Citizens of theUnited States of America, residing at Vashington, District of Columbia,have invented new and useful Telephone Attachments, of which thefollowing is a specification.

Designed for particular use with desk telephones, the principal purposeof the invention is the provision of a device for fixed attachment tosuch a telephone, the device having a lever overlying the receiver hookof the telephone and locking the hook in the depressed position exceptat times when it is desired to use the telephone, when the lever may bereleased by the insertion of a coin or key'into' the device.

A further purpose of the invention is to provide for the device aregister connected with the coin or key releasing mechanism thereof, sothat each time the telephone is used for an outgoing call, such callwill be recorded.

A still further purpose contemplates the provision of means forunlockingthe lever of the device in response to the operation of the signal bellof the telephone when an incoming call is being made, this meanseffecting the unlocking of the lever without operating the register andalso effecting the relocking of the lever after a prescribed interval oftime, in the event that the telephone is not answered within the saidinterval of time following the operation of the signal bell.

A still further purpose of the invention is to provide a casingv inwhich the locking lever is pivoted and from which it projects, thiscasing standing beside the telephone and containing all the attendantmechanism which permits the locking lever to perform its functions ineach of the several ways mentioned above.

A still further purpose is the provision of means conjoined with thelocking lever whereby, when the latter has been once released and thereceiver hook allowed to rise preparatory to making an outgoing oranswering an incoming call, the receiver hook may be vibrated to attractthe attention of the central operator without relocking the lever.

A still further purpose aims at the provision of a suitable base for thecasing which carries the locking lever, this base permit ting the wholedevice to be attached to the base of a desk telephone in such a mannerthat it cannot be removed therefrom except by the disconnecting of aclamp positioned within the casing;

Still further and other purposes will be made to appear as the inventionis set forth in detail in the description which follows.

To the exact construction in which it is shown and described, theinvention is not to be restricted. The actual reduction to practice mayshow certain desirable changes or alterations to be of advantage and theright is claimed to make any which do not depart from the spirit of thesubjoined claims.

The same numerals of reference designate the same parts throughout theof the drawings, wherein:

Figure 1 is a view in side elevation showing the application of theinvention to a conventional form of desk telephone.

Fig. 2 is a front elevation of the structure shown in Fig. 1.

Fig. 3 is a top plan view.

Fig. i is a vertical sectional view through that portion of the casingof the device which contains all its operating mechanism.

Fig. 5 is a section on the line 5-5 of Fig. at.

Fig. 6 is a section on the line 6-6 of Fig. 4:.

Fig. 7 is a section on the line 7- -7 of Fig. 4.

Fig. 8 is an enlarged detail view showing in end elevation the mechanismcomprising the time trip.

Fig. 9 is a front elevation of the structure in Fig. 8.

Fig. 10 is a section on the line 10-10 of Fig. 8.

Fig. 11 is a diagrammatic view of the electro mechanical mechanismconnected with the time trip.

Fig. 12 is a perspective view of the guard used to inclose the bells ofthe magneto and devices conjoined therewith.

Fig. 13.is a detail collective perspective of v the connecting ends ofthe several levers forming the locking device.

Fig. 1% is a perspective view of the key used for operating the lockingdevice.

Fig. 15 is an enlarged detail view of a portion of the escape wheel withits attendant pawl and the lever associated therewith.

Fig.- 16 is a section on line 16 of Fig. 15.

' Referring to the drawings, there is shown,

a conventional form of desk telephone A having the attachment B securedto it. The telephone is provided with the usual base several figures 1.the receiver hook 2 and the receiver 3, the attachment comprising acasing 4 and a hollow column 5 on which the casing is supported. A lever6 is pivotally mounted within the casing and extends far enough outtherefrom to overlie the receiver hook 2 adjacent the point where thelatter enters the telephone structure. The attachment is fixedlconnected to the telephone by means 0 a crow-foot base made up of twoarms 7 and a third arm 8, the latter being permanently connected withthe bottom of the column 5. These three arms comprising the base of theattachment are designed for embedding in the felt covering 9 ordinarilyattached to the telephone base 1 and the two arms 7 terminate inintegral hook members 10 which hook around the edge of the telephone.base, thus securing these arms to the latter. The arm 8 is secured tothe telephone base by means of a detachable Z-shaped clamping member 11whose one leg overlies the telephone base and whose other leg is securedto the bottom of the column 5 by a detachable device 12, this clampingmember 11 being secured to the bottom of the column on the interior ofthe latter.

When the crow-foot base of the device is attached to the telephone basein the manner just described, its column 5 stands parallel with the bodyof the telephone and abuts the base of the latter on the edge, thuspermitting the lever 6 to lie on top. of the receiver hook 2 near thepoint where the latter enters the telephonestructure, as beforedescribed.

The column 5' is hollow and access is had to the interior thereof bymeans of a hingedly mounted door-.13 which is held -in the position ofclosure by any suitable locking device 14.

The casing 4 which is approximately square in elevation is positioned ontop of the column 5 to which it is attached in any appropriate manner.In the upper right hand corner, the casing .4 carries a conventionalform of register 15 which is interior to the casing but whose dials 16are visible through the holes formed in the front of the casing. A coinchute 17 is also carried within the casing 4 against the back thereof,this. coin chute projecting from the easing through the top adjacent theleft side, then curving over toward the center of the casing as itpasses down through the latter and finally communicating with theinterior of the column 5 through the bottom of the casing.

A stud 18 is attached at an app opriate point on one face of the chute17 and this stud carries at its end a bell crank lever 19 which ispivotally connected to the stud and whose shorter arm effects pivotalengagement with the end of the arm 20 which is casing 4. The purpose ofthis lateral'extension 21 is to communicate movement to the lever 19 andthrough the latter effect the operation of the register 15 and thislateral extension is contacted with and moved by a block 22 which isrigidly secured to a lateral extension 23 formed on the upper end of thevertical leg of the bell crank lever 24. This bell crank lever 24 ispivotally mounted on the end of the stud 25 which is suitably mounted onthe back wall of the casing 4 and projectstoward the front of thecasing, lying close to the left hand side of the chute 17. The block 22is designed to enter the coin chute 17 and effects this entrance throughan aperture 26 formed in the side of the chute in the vicinity of theblock and that end of the block which enters the chute is formed to theshape of the curve having the same the chute engaging'the coin after thelatter has been once dropped into the chute and holding the coinsuspended until the o eration of other devices, yet to be descrlbed,forces the coin down through the chute, thereby moving the block out. ofposition and rocking the bell crank lever 24 on its pivotal connection.

The legs of the bell crank lever 24 together form a right angle, therebyleaving the bottom leg in the horizontal position when the otherleg isin its normal position which is vertical.

The free end of the horizontal leg of the bell crank lever 24 isbifurcated leaving the cars 27 which are provided with holes 28, theends of the ears being circular in out line and formed with the holes 28as centers. On the bottom edge of this horizontal leg, there is formedan abutment shoulder 29 which is equal to the thickness of the leg andwhose flat face 30 stands in a plane passing vertically through thecenters of the holes 28. Connected with the horizontal leg of,

engages a stud 34 which passes through the holes 28 in the ears 27 andthrough the hole 33 in the ear 32. The arm 31 has an abutment shoulder35 formed on its bottom edge which shoulder has a flat face 36 which tobe raised on its pivotal connection on the pin 34 without any movementbeing imparted to the horizontal leg of the lever.

There is also pivotally mounted on the pin 34 a lever 37 which isattached to the pin on the front side of the lever 24, this lever 37being provided with the hole 38 by which it is attached to the pin andbeing provided also with a circular end formed with the hole 38 as thecenter. The lever 37 is further provided with an abutment shoulder 39having a flat face 40 adapted to abut the flat face 36 of the abutmentshoulder 35 of the arm 31, this abutment shoulder 35 being extendedlaterally a sufficient distance to permit the shoulder 39 to contactwith it. This arrangement permits the arm 31 to be raised by any forcewhich depresses the lever 37. Thus the arm 31 may be raised by eitherthe lever 37 or the lever 24, either one raising the arm withoutinterfering with the other.

The lever 6 which is designed to hold the receiver hook 2 depressed ispivotally mounted within the casing 4 on a stud 41 which is attachedbetween the front wall of the chute 17 and the front wall of the casing4. The lever 6 on its top edge is provided with a recess in which thearm 31 is adapted to lie, the end of this arm abutting the end of therecess formed in the lever and serving to hold the lever in its lowestposition where it may keep the receiver hook 2 depressed. The lever 6passes through an opening 42 formed in the right hand side of the casing4, this opening being of a width greater than the thickness of the leverand being provided on its bottom edge with a slot 43. The lever 6 isrequired to pass into the slot 43 in order to depress the receiver hook2. The height of the opening 42 is substantially equal to the height ofthe lever 6 and when the latter is raised against the top edge of theopening, that portion of the lever which projects out of the casing 4 ispermitted to move laterally in the opening 42, which lateral movement ismade possible by the lever 6 being made in two parts which are hingedlyconnected together by the hinge member 44. A flat spring 45 ispermanently connected on the back of that portion of the lever 6 whichis on the stud 41 and this spring presses upon the hinged portion of thelever, thus imparting to it the lateral movement before referred to whenthe lever is not engaged in the recess 43.

The lever 6 is provided with an arm 46 projecting from its lower edgeand extending around below the receiver hook 2. This arm is adapted tobe contacted'with by the receiver 3 to offset the tendency of the spring45 to break the lever at its hinged connection.

Positioned on the back of the casing 4 at a specified point above thefree end of the arm 31, there is a post 47 at the end of which a hookmember 48 is pivotally mounted.

This hook member 48 is provided with a laterally extending L-shaped arm49 joined to it at the point where it effects its pivotal connectionwith the post. The lower end of the hook member 48 drags against theside of the arm 31 and its hook portion is intended to engage underneaththe arm when the latter is raised. To trip this hook member 48 fromengagement below the arm 31, an L-shaped member 50 is attached on theside of the lever 6, the turned end of this member being adapted, whenthe lever 6 rises, to engage underneath the laterally extending arm 49and to rock the hook member 48 on its pivotal connection, thus effectingits release from the arm 31.

The lever 37 is designed to be operated by an electromagnet 51positioned on the bottom of the casing 4 and interior to the latter.Positioned beside the magnet 51 and attached on the front wall of thecasing 4, from which it is insulated, there is a contact member 52, thelever 37, when it is drawn down by the magnet 51, making contact withthis contact member 52 to establish a circuit to a magnet 56 which ispositioned on the front wall of the casing just below the stud 41. Toprevent the lever 37 from contacting with the contact member 52 when thearm 31 is raised by the bell crank lever 24, a spring 53 is providedwhich is attached between the free end of the lever and the end of thestud 54 mounted on the front wall of the casing 4. This s ring tendsnormally to hold the lever 3 up against a pin 55 which is also attachedon the front wall of the casing 4.

The magnets 51 and 56 are energized from a source exterior to the casing4, this source comprising a battery 57 from which current is derived byclosing the circuit of this battery through the instrumentality of amechanism carried on the magneto casing 58. This circuit closing devicecomprises a plate 59 which is attached in any suitable manner on top ofthe box 58. A lever .60 is pivotally mounted on this plate and one endof this lever is bifurcated, so that it may straddle the stem of theclapper 61. The other end of the lever is offset in order that it maymake contact with a contact member 62 which is attached to but insulatedfrom the plate 59. Contact between the contact member' 62 and the offsetend of ,the lever 60 is made and broken when the lever 60 is oscillatedby the vibration of the clapper 61. One terminal of the magnet 51 isconnected with the contact member 62 by a wire 63. One terminal of thebattery 57 is connected with the plate 59 by a wire 64. The otherterminal of the battery 57 is connected to the contact member 52 by awire 65, the remaining terminal of the magnet 51 being attached to thewire 65 by means of a wire 66. In order that the magnet 56 may becontrolled by the lever 37, one terminal of this magnet is connected toone terminal of the battery 57 by a wire 67, the other terminal of themagnet efiecting metallic connection with the casing 4 or with the lever37 by means of the wire 68.

The magnet 56 acts as an electromagnetic release for the escape wheel 69which is rotatably mounted on the stud 70 that is fixed in the frontwall of the casing 4. This escape wheel has attached to it by means ofscrews 71 a ratchet wheel72 whose teeth are engaged by a pawl 73 that isloosely mounted on astud 74 attached on the back face of a sheave 75.This sheave 75 is also rotatably mounted on the stud 70 and on its outerface there is attached to it one end of the valve spring 76 which iswound in the form of a spiral and has its remainin end fixedly attachedto the stud 70. It willlthus be seen that the escape wheel 69 may berotated by any force tending to turn the sheave in the direction of thearrows (shown in Fig. 9), since the pawl 74 whichis at tached to thesheave will engage the teeth of the ratchet wheel 73, thus imparting tothe escape wheel 69 the same movement that is given to the sheave 75. Togovern the speed at which the escape wheel 69 moves a verge 77 is.rovided and this vergeis rockably mounted on a stud 78 fixed in thefront wall of the casing 4 directly above the stud 70. The oscillationsof the verge 77 are governed by an upstandin arm 79 which connects withthe center 0 the verge and which carries at its free end an appropriateweighted member 80. The sheave 75 and with it the escape wheel are movedas a result of tension applied on the sprin 81 whose one end connectswith one end 0 the cable 82,,which cable passes around the upper portionof the groove of the sheave and has its remaining end aflixed to thesheave in any. suitable manner.

To prevent the spring 81 from operating the escape wheel, except whencertain conditions require that it operate the said wheel, a hook pawl84 is provided which pawl is pivotally mounted on a stud 85 attached tothe front wall of the casing 4. The hook pawl 84 is held normally inengagement with the teeth of the escape wheel by means of a fiat spring86 which is attached to the front wall of the casing and bears upon thepawl. The pawl, however, is disengaged from the teeth of the escapewheel by the magnet 56 when the latter is energized, the magnet beingplaced in such a position that it can by attraction effect thisdisengagement of the pawl 84. The pawl 84 having been once disengagedfrom the teeth of the escape wheel 69, it is held in such disengagedposition by a lever 106 which is pivotally mounted on a pin 102 which,like the pin 85, is also attached to the front wall of the casing 4.This lever 106 is provided with a projection 104 on its lower edgebehind which the pin 105, which is secured to the pawl 84, engages whenthe pawl is withdrawn from the teeth of the escape wheel. The free endof the lever 106 has pivotall connected to it a Z-shaped lever 109, theeg 110 of which lies on the upper edge of the lever 106 and is heldnormally against the upper edge of this lever by a flat spring 111 whichis attached on the upper edge of the lever 106.

and bears upon the upper edge of the leg 110. The nature of thecombination of the levers 109 and 106, permits the free end of the lever109 to be depressed without any relative movement of the lever 106 butit necessitates the raising of the lever 106 when the free end of thelever 109 is raised. The free end of the lever 109 lies adjacent to theperiphery of the sheave 75 and the latter carries a removable lug 103 onits periphery which is designed to engage the free end of the lever 109and to raise the latter a suflicient distance to disengage theprojection 104 from the pin 105 when the spring 86 may return the pawl84 to engagement with the teeth of the escape wheel 69.

The removable lug 103 is capable of being positioned at different pointson the periphery of the sheave 75, radial holes 108 being formed in thebottom of the groove of the sheave at uniformly spaced intervals betweencertain points thereon. This arrangement permits the'lug 103 to beshifted to different points on the sheave 75, so that it operates tolift the lever 106 and release the pawl 84 after the elapse of specifiedintervals of time following the beginning of rotary movement of thesheave and the escape wheel.

5 The sheave 75 between certain points on that face to which the spring76 is attached is provided with axially disposed holes 107 arranged atuniformly spaced intervals and any one of these holes may have insertedinto it the axially disposed pin 101 which, when the sheave and theescape wheel are put in motion is adapted to move toward the hook member48 and engage the laterally extending L-shaped arm of the latter torelease the hook member from engagement beneath the lower edge of thearm 31.

To create in the spring 81 sufficient tension to enable it to impartmovement to the escape wheel 69, a lever 87 is provided which ispivotally mounted on a stud 89 that is fixed in the front wall of thecasing 1 near the right hand side and near the bottom of the latter. Thefree end of this lever ST is connected with one end of the spring 81.The lever 87 is provided with a laterally extending Z-shaped arm 88which extends under the bottom edge of the lever 6. When the latterlever is raised, the spring 81 is relieved of tension but when the lever6 is lowered, as it is when locked by the arm 31, the free end of thelever 87 is depressed because this lever is of necessity lowered throughits connection by means of the laterally extending arm 88 with the lever6.

A shield 90 is provided for attachment to the wall on which the magnetocase 58 is hung, this. shield being designed to inclose the magnetobells and the circuit closing device comprising the plate 59 and lever60. so that access may not be had to them to permit their manipulationby hand.

In Fig. 1-1 there is shown a key 91 which is designed for passagethrough a key-hole 92 formed in the front of the casing 4, the coinchute 17 being provided with a round hole 93 to receive the end of thekey and'steady the same when either of its wings 91 is brought intocontact with the vertical arm of the bell crank lever 24.

The block 22 is designed to hold the coin when the latter. after havingbeen dropped into the chute 17 contacts with it. The coin is releasedfrom engagement with the block and the bell drank lever 24 operated atthe time of this release by means of the bell crank lever 95 which ispivotally mounted on the pin 96 aflixed in the two ears 97 between whichthe bell crank lever 95 is supported. One end of the bell crank lever 95enters the coin chute 17 through a suitable slot provided in the frontwall of the chute just above and between the ears 97. This arm of thelever. however, which enters the chute is held normally in such aposition that it will not interfere with the passage of a coin downthrough the latter. this position being obtained by means of the flatspring 98 whichis attached on the front face of the coin chute and bearson the longer arm of the lever. the end of this longer arm being engagedby the end of the pin 99 which passes slidably through a hole formed inthe front of the casing 4 and which is provided with a collar 100interior' to' the casing 4, which collar prevents the pin moving fartherthan a specitied distance through the front of the casing. The spring 98besides keeping the shorter arm of the lever 95 in such a position asnot to interfere with the coin passing down the chute 17. also operatesto hold the pin 99 in such a position that its collar 100 abuts theinner face of the front wall of the casing.

Assume the device to be attached to a con ventional form of desktelephone by affixing its crow-foot base to the base of the telephone asbefore described. Let the lever 6 be in the position where the arm 31engages in the recess, before referred to as being formed in. the lever.In order for the arm to effect this engagement in this recess, it

is necessary that the lower edge of the'lever, where it passes throughthe opening 42 of the casing 4. be in the recess 43 which is formed inthe opening. The free end of the lever 6 will then hold the receiverbook 2 depressed and it will be impossible to use the telephone becausethe receiver hook cannot be raised to establish the necessary connectionpreparatory to the use of the phone. The lever 6 may be disengaged inany one of three ways; namely, by dropping a coin in the chute 17, byusing the key 91, or by the operation of the signal bells on the magnetocasing. The owner or subscriber to the telephone, it is proposed, shallhave a key for effecting the disengagement of the arm 31 from the lever6. Other persons than the subscriber or owner are required to use a coinin the event that they desire to use the telephone.

Take the case of a person who is required .to use a coin. Such a persondrops a coin in the top of the chute 17 and this coin passes down thechute but is arrested when brought into contact with the block 22. Thecoin is then in a position when it can not continue further down thechute until .the bell. crank lever 95 is operated. The pin 99 serves tooperate this lever by pressure exerted upon its head. The shorter arm ofthe lever which projects into the coin chute then engages the upper endof the coin and forces it past the block 22, thereby forcing theprojecting end of the block out of the chute and rocking the bell cranklever 24 with which the block is connected. This movement imparted tothe block 22 also rocks the bell crank lever 19 which, by connectionwith the register 15, causes the unit hand of the latter to be moved thedistance of one calibration. The rocking of the bell crank lever 24serves to lift the arm 31 until the hook member 48 engages beneath thelower edge thereof. This movement imparted to the arm 31 by the bellcrank lever 24 does not, however, result in lowering the lever 37. sincethe arm 31 may be raised either by the lever 24 or the lever 37 the onewithout disturbing the relative position ing which is higher than therecess 43 with which the lower edge of the lever previously engaged.While the receiver remains ofi its hook the call may be made over thetelephone in the usual way, the receiver hook being free to beoscillated to attract the attention of the operator in the usual way,since the lever 6 is in such a position in the opening 42 that it cannotlower when the receiver hook is oscillated. When the lever 6 rises asthe result of the pressure exerted by the spring on the receiver hook,

the L-shaped member 50 engages the laterally projecting L-shaped arm 49of the hook 48 and effects the release of the hook from the lower edgeof the arm 31. The arm 31 then drops back on the lever 6 but its endcannot engage the end of the recess in the latter because the lever 6 israised. The free end of the arm 31, therefore, lies on the upper edge ofthe lever beyond the end of the recess.

The usual call may then be made over the telephone after which thereceiver 3 is again placed on its hook. With the replacing of thereceiver on its hook, the receiver engages the arm 46 connected with thehook,

thus moving the hinged end of the lever 6 I back to its former positionagainst the pressure of the spring 45. When the weight of the receiverdepresses thehook, the lever 6, then being in a position to drop 1n therecess 43, lowers into the latter by gravity. When the lever 6 lowersinto the recess 43, the end of the arm 31 slides ofi the upper edge ofthe lever and into the recess 1n the latter prepared for it, the end ofthe arm engaging the end of the recess and holding the lever looked asbefore.

In the event that the owner or subscnber to the telephone desires to usethe latter, he inserts his key 91 through the key-hole 92 and turns thekey one of whose wings engages the adjacent edge of the vert1c al leg ofthe bell crank lever 24, operating 1t and the bell crank lever 19 in thesame Way that they were operated by the coin. The same cycle ofoperations is performed by the various parts when the key 15 used aswhen .the coin is inserted through the coin chute.

The telephone is therefore, placed in condition to permit it to be usedfor an outgolng call and a record is made, on the register, of thetelephone having been placed in such condition.

In the case of an incoming call, the clapper 61 of the bell is Set intovibration and its stem operates to oscillate the lever 60, therebyclosing the circuit on the battery 57 which supplies current to themagnet 51, causing it to attract the lever 37 which operates to raisethe arm 31 and permits the latter to be engaged by the hook member 48.The lever 37 eifects this movement of the arm 31 without any movement ofthe bellcrank levers 24 and 19. Therefore, this operation of releasingthe arm 31 is not recorded on the register. This provision is made sothat incoming. calls will not be recorded, since it is common practicenot to charge for. these calls and a record of them is not essential andwould only confuse the record of the outgoing calls for which onlycharges are made. To raise the arm 31 to the position where it unlocksthe lever 6 would make it possible to use the telephone for an outgoingcall without the use of the coin or key in case the signal of theincoming call were not answered. Provision is made against such acontingency by the use of the escape wheel and its attendant partspreviously described. When the magnet 51 attracts the lever 37, thelatter is brought into contact with the contact member 52, thus closingthe circuit on the magnet 56 which then attracts the pawl 84,withdrawing it from engagement with the teeth of the escape wheel 69 andbringing its pin 105 behind the projection 104 of the lever 106.

In the lowered position of the lever 6, a strain is created on thespring 81 by the depression of the free end of the lever 87. Therefore,when the pawl 84 is released from the escape wheel, this spring 81operates to rotate the escape wheel, the verge 77 oscillating toregulate the speed of rotation. As the escape wheel is rotated throughthe instrumentality of the sheave 75 which rotates in the same directionwith it, the pin 101 which is axially disposed on the face of the sheavemoves toward the hook member 48 and, when it reaches the latter,

engages the laterally projecting L-shaped I recess of the lever 6,thereby relocking the lever.. Thus when the magneto signals the factthat there is some one calling, the lever 6 is automatically relockedafter the prescribed interval of time, in the event that the incomingcall is unanswered, this interval of time being that length of time thatis required for the pin 101 to travel from its normal position to thepoint where it-contacts with and operates the hook member 48.

In the event that the ringing of the incoming call stops before the pin101 travels from its normal position to the point where it operates thehook member 48, the magnet 51 will be .deenergized and thus permit thespring 54 to draw the lever 37 back against its pin 55. thereby openingthe circuit of the magnet 56 by the separation of the lever 37 and thecontact member 52. The deenergizing of the magnet 56 would permit thepawl 84 to be returned to engagement with the teeth of the escape wheel69, were it not for the lever 106 which holds the pawl out of engagementwith the teeth until the lug 103 positioned on the periphery of thesheave 75 contacts with the free end of the lever 106 to effect itsdisengagement from the pin 105 of the pawl 84. This lug 103 is adaptedto contact with the free end of the lever 106 at the same time that thepin 101 engages the arm 49 of the hook 48. Therefore, the arm 31 isreleased by the hook 48 and the pawl 84 by the lever 106 at practicallythe same time. The pawl 84 then drops back into the teeth of the escapewheel 69 and further movement of the escape wheel is prevented.

' Assume that the telephone is answered' before the prescribed intervalof time elapses after the ringing of the magneto bell. The receiver 3 isremoved from the hook 2, the spring of which raises the latter, and withit the lever 6. thereby relieving the spring 81 of the tension to whichit was previously subjected. The spring 7 6, which is a relatively lightspring compared to the spring 81 and which was subjected to a torsionalstrain during theinitial movement of the escape wheel, serves to returnthe sheave 75 to its normal position. the pawl 7 3 attached to thesheave ratcheting over the teeth of the ratchet wheel 72 during thisreturn movement of the sheave 75, the engagement of the verge 77 withthe teeth of the escape wheel preventing the reverse movement impartedto the sheave 75 from being communicated to the escape wheel.

Taking a condition where the telephone is not answered in response tothe ringing of the magneto; the lever 6 being in the lowered positionand thereby tensioning the spring 81. the withdrawal of the pawl 84 bythe magnet 56 allows the escape wheel to be put in motion. when the pin101 travels toward and finally disengages the hook 48 from the arm 31.Simultaneous with the operationcof the pin 101 releasing the hook 48from the arm 31. the lug 103 engages the lever 109 to release the pawl84 from engagement with the projection 104 of the lever 106. therebyallowing the pawl 84 to drop back in engagement with the teeth of theescape wheel 69 and permitting all parts to resume their formercondition with the exception of the spring 81 whose tension is reduced.with this condition of affairs. it is assumed that there are pins 101 ineach of the holes 107 and lugs 103 secured in each of the holes 108 onthe periphery of the sheave 75. The failure to answer the first incomingcall results in that pin 101 which is nearest the hook 48 operating thelatter to release the lever 31. the foremost lug 103 at the same timeoperating the lever 109 and releasing the pawl 84. A second signal of anincoming call which remains unanswered. then operates to disengage thepawl 84 as in the previous instance, when the next succeeding pin 101and the next succeeding lug 103 operate to release the hook 48 and thelever 109 in the sameway that the preceding pin and lug operated. Thenumber of incoming calls which may remain unanswered and yet reestablishthe locking of the lever 106 after having once unlocked thesame, dependsupon the number of pins 101 employed and the number of lugs 103 alsoemployed.

By making the pins 101 removable, either one or a mnnber of these pinsand the corresponding number of lugs may be employed,

thereby varying the intervals of time during which the lever 6 mayremain unlocked. In this way the apparatus may be regulated to requirethe punctual answering of the telephone or to allow a relatively greatlength of time in which to answer the same.

Also the particular arrangement of the removable pins permits arelatively fair record to be made of the number of incoming calls duringthe absence of the subscriber. For example: If fourpins 101 are employedand two are found to have operated the hook 48 after the return of thesubscriber, it will be apparent that the magneto bell hasbeen rungtwice. since it will be evident that the magnet 56 has been energized intwo instances to release the pawl 84 in each of these two instances topermit the spring 81 to move the escape wheel 69 through an angulardistance corresponding to the angular distance between the two pinsinvolved.

In the=case of using a plurality of pins 101 and lugs 103. the spring 76is permitted to return the sheave 7 5 to its normal position after thelever 6 has been raised, (the spring 81 being thereby relaxed enough torelieve it of any tension) the lever 109 yielding (against the pressureof the spring 111) to permit the lugs 103 to pass it on the return ofthe sheave 75.

The invention having been described, what is claimed as new and usefulis:

1. A telephone lock comprising in combination a manual releasing means.an automatic releasing means. and a register operable by the manualreleasing means only.

2. A telephone lock comprising in combination dual manual means eitherof which is operable for releasing the same. an automatic releasingmeans. and a register operable by either of the manual releasing meansbut not by the automatic means.

, the receiver hook of the telephone, with the locking device connectedwith said member, a register connected with the locking device, aduality of manually actuatable mediums by either of which the locln'ngdevice may be released and the register operated, and mechanism whichreleases the locking device without operating the register, said'mechanism being rendered operative by incoming calls.

5. In an attachment for telephones, a member for engaging and holding inits de pressed position the receiver hook of the telephone, lockingmeans for said member, a duality of manually actuatable mediums eitherof which is operable to release said locking means and permit the memberand the hook to rise on the removal of the re-. ceiver from the latter,and a device cooperating with the said locking means and with the memberso that the latter may immediately lock the hook in its depressedposition on the replacing of the receiver thereon,the said means beingautomatically returnable to normal position irrespective of the mediumby which it is operated.

6. In an attachment for telephones, a member for engaging and holdingdepressed the receiver hook of the telephone, alocking device for themember, means operatively connected with said device to release themember independently of the receiver hook, and positive means forholding said member released except when the receiver is replaced on thehook.

7 In an attachment for telephones, a. lever for engaging and holdingdepressed the receiver hook of a telephone, a locking device engagingthe lever, means operable from the exterior of the attachment foreffecting the release of the said device from the lever independently ofthe receiver hook, and further means connected with the telephonemechanism whereby the signal of an incoming call will operate to releasethe said device for a prescribed interval of time only and irrespectiveof the time of duration of said signal.

8. In an attachment for. telephones, a. lever for engaging and holdingdepressed.

the receiver hook of a telephone, a. locking device engaging said lever,a dual manual release of aforesaid device either element of which isoperative for performing the releasing function, and a time controlledautoreceiver hook depressed, a duality of manually actuatable mediums byeither of which the latter mechanism may be actuated to release thelever, and means by which the said mechanism may be released for aprescribed interval of time succeeding the signal of an incoming call.

' 10. The combination with a desk telephone, of a device attachable tothe base of Y the telephone, a lever carried by said device and engagingthe receiver hook of the tele phone, a locking mechanism within thedevice and engaging the lever to hold the receiver hook depressed, aregister carried in said device, connections between the register andthe locking mechanism, a duality of manually operable mediums by eitherof which said locking mechanism may be released and the registeroperated at the same time, and means by which the locking mechanism maybe released for a prescribed limit of time only and without theoperation of the register.

11. The combination, with a desk telephone. of a casing designed tostand beside the telephone and provided with a base to underlie thetelephone base, means whereby the base of the casing may be fixedlyattached to the telephone base in such a way that it may be detachedonly from within the casing, a lever pivotally mounted in such casingand protruding therefrom so as to overhang the receiver hook of thetelephone, and a manually releasable locking device engaging the lever,whereby the receiver hook is held depressed andthe telephone renderedinoperative until the release of said locking device.

12. The combination, with a desk telephone, of a casing adapted to standbeside the telephone, a crow-foot base for said casing adaptedtounderlie the telephone base, the said crow-foot base being provided witha plurality of arms to one of which the easing is connected, all of saidarmse'xcept that connecting with the casing being provided with hookedends which engage the telephone base, a clamping member 'detachablyconnected with the bottom of the casing on the interior thereof, saidclamping member also engaging the telephone base, a lever pivotallymounted in the casing and protruding therefrom so as to overhang thereceiver hook of the telephone, and a manually releasable locking deviceengaging the lever, whereby the device as a whole is. attachedto thetelephone in such a way that the receiver hook is held in its depressedposition and the telephone thereby rendered inoperative.

13. The combination, with. a desk telephone, of a casing adapted tostand beside the telephone and provided with a base, means whereby thebase ofjthe casing may be fixedly attached to the telephone base in sucha way that it may be detached therefrom only from within the casing, alever pivotally mounted in said casing and protruding therefrom so as tooverhang the receiver hook of the telephone, a locking device engagingthe lever, mechanical means for releasing the locking device to permitthe telephone to be used for outgoing calls, and electro-mechanicalmeans for releasing the locking device in response toan incoming call.

14:. The combination with a desk telephone, of a casing adapted to standbeside the telephone and provided with means for detachable connectionthereto, a lever pivotally mounted in said casing and protrudingtherefrom so as to overhang the receiver hook of the telephone, alocking arm engaging said lever to hold the receiver hook of thetelephone depressed,-a bell-crank lever pivotally mounted in the casingand operatively connected with the locking arm, and

' a duality of manually operable mediums by either of which the saidbell-crank lever may be actuated to effect the release of the {ockingarm from the aforesaid lever.

15. The combination with a desk telephone, of a casing adapted to standbeside the telephone and provided with means for attachment thereto, alever pivotally mounted in said casing and protruding therefrom so as'to overhang the receiver hook of the telephone, a locking arm engagingsaid lever to hold the receiver hook 'of the telephone depressed, abell-crank lever pivotally mounted in the casing and operativelyconnected with the locking arm, a register with in the casing, operativeconnections between the register and the bell-crank lever, and a dualityof manually operable mediums by either of which the said bell-cranklever may be actuated to simultaneously effect the release of thelocking arm and the operation so as to overhang the receiver hook of thetelephone, a locking arm engaging the lever to hold the receiver hookdepressed, mechanical releasing means for the locking arm a secondlever; connected with the locking arm, and electromagnetic means whereby said second lever may be operated and ehe locking arm released fromthe first said ever.

17. The combination, with a desk telephone, of a casing adapted to standbeside the telephone, and provided with means for detachable connectiontherewith, a'lever pivotally mounted in said casing and protrudingtherefrom so as to overhang the receiver hook of the telephone, alocking arm engaging said lever to hold the receiver hook depressed, abell crank lever pivotally mounted 1n the casing and having connectionwith said locking arm, a second lever connected with said locking arm,means connected with a bell-crank lever whereby it may be operatedmanually to effect the release of the locking arm from the first saidlever and electromagnetic means 006 erating With said second lever toalso e ect the release of the locking arm from the first said lever.

18. The combination, with a desk telephone, of a casing adapted to standbeside the telephone and provided with means for detachable connectiontherewith, a lever pivotally mounted in said casing and protrudingtherefrom so as to overhang the receiver hook of the telephone, alocking arm engaging said lever to hold the receiver hook depressed, abell-crank lever pivotally mounted in the casing and connected with thelocking arm, a register, connections between the register and thebell-crank lever, a second lever connected with the locking arm,mechanical means whereby the bell-crank levermay be operated 'to releasethe lockingarm from said lever and to simultaneously operate the register, and electromagnetic means connected with said second leverwhereby the locking arm may be released from the first lever without theoperation of the register.

19. The combination, with a desk tele- 110 phone, of a casing adapted tostand beside the telephone, and having means for detachable connection.therewith, a lever pivotally mounted in said casing and protrudingtherefrom so as to overhang thereceiver 115 hook of the telephone, alocking arm engaging'said lever to hold the receiver hook depressed,mechanical releasing means for the locking arm, an electromechanicalrelease for the-locking arm, and an electromechan 120 ical timing deviceconjoined with the electrome'chanical release, whereby said locking armmay be restored, to engagement with the said lever after a prescribed.in I terval of time. I 125 20,-The combination, with a desk 'telephone,of a casing adapted to standbeside the telephone, and provided withmeans for detachable connection therewith, a lever pivotally mounted insaid casing and pro- 130' truding therefrom so as to overhang thereceiver hook of the telephone, a locking armengaging said lever to holdthe receiver hook depressed, releasing means for said locking arm, atiming device for restoring the locking arm to engagement with thelever, and means contained in, the timing device whereby the interval oftime required for its operation may be varied.

21. The combination with a desk telephone of a casing adapted to standbeside the telephone and provided with means for attachment thereto, alever pivotally mounted in the casing and protruding therefrom so as tooverhang the receiver hook of the telephone, a locking arm engaging thelever to hold the receiver hook depressed, a bellcrank lever pivotallymounted in the casing and engaging the locking arm, and a dual-' ity ofmanually actuatable mediums by either of which the said bell-crank levermay be operated to release the locking arm from the aforesaid lever,both of said mediums having exteriorly exposed operating means.

22; The combination, with a desk telephone, of a casing adapted to standbeside the telephone and provided with means for attachment thereto, alever pivotally mounted in said casing and protruding therefrom so as tooverhang the receiver hook of the telephone, a locking arm engaging thelever to hold the receiver hook depressed, releasing means for saidlocking arm, a timing device for restoring the locking arm in engagementwith the lever, and a tensioning device connected-with the lever wherebymotion is imparted to the timing device.

23. The combination, with a desk telephone, of a casing adapted to standbeside the telephone and provided with means for attachment thereto, alever pivotally mount- 1 ed in said casing and protruding therefrom soas to overhang the receiver hook of the telephone, a locking armengaging the lever to hold the receiver hook depressed, releasing meansfor said locking arm, a timing device for restoring the locking arm toengagement with the lever, a tensioning device connected with the leverwhereby motion is imparted to the. timing device, and means contained inthe timing device whereby the interval of time required for itsoperation may be varied.

24. The combination, with a desk telephone, of a casing adapted to standbeside H the telephone and provided with means for attachment thereto, alever pivotally mounted in said casing and protruding therefrom so as tooverhang the receiver hook of the telephone,'the casing being providedwith an opening of a width greater than the thickness of the lever, thesaid openin having a recess formed in its bottom e ge, a

l'ooking arm engaging the lever when the latter is. in said recess,thelever comprising two parts hingedly connected together, so that one maymove laterally, andan arm connected with the laterally movable part ofthe lever whereby, when the receiver of the telephone is on its hook,the laterally movable part of the lever may engage in said recess tohold the receiver hook depressed, and means for effecting the release ofthe locking arm from the lever.

25. The combination, with a desk telephone, of a casing adaptedto standbeside the telephone and having means for attachment thereto, a leverpivotally mounted in said casing and protruding therefrom so as tooverhang the receiver hook of the telephone, a locking arm engaging thelever to hold the receiver hook depressed, a pivotally mounted hookmember within the easing, means for releasing the locking arm so that itmay be engaged by the hook member, and means for tripping the hookmember from release with the locking arm.

26. The combination, with a desk telephone, of a casing adapted to standbeside the telephone and provided with means for attachment thereto, alever pivotally mounted in said casing and protruding therefrom so as tooverhang the receiver hook of the telephone, a locking arm engaging thelever to hold the receiver hook depressed, a bell-crank lever pivoted inthe casing and having connection with the locking arm, a second leverconnected with said locking arm, a hook member pivotally mounted in thecasing, mechanical means for rocking the bell-crank lever to effect therelease of the locking-arm and effect its engagement by the hook member,electromagnetic means for'eflecting the release of the locking arm andeffecting its engageinent by the hook member, a member carried by thefirst said lever to release the hook member from engagement with thelocking arm, and a timing device having means for releasing the hookmember from engagement with the locking arm.

the said aperture having a recess formed at its bottom, a locking armengaging the lever to hold the receiver hook depressed when the lever isin saidirecess, an arm, connected to the free end of the lever andengageable by the telephone receiver t0'position the lever forengagement in said recess,

a bell crank lever pivoted in the casing and having engagement with thelocking arm, a second lever connected with the locking arm, mechanicalmeans for operating the bell crank lever, electromagnetic means for operating the said second lever, a hook pivotally. mounted in the casingand adapted to engage the locking arm, whereby, when either the secondlever'or the bell crank lever are operated the hook may engage thelocking arm, and a timing device having means for engaging the hook toeffect the release of the latter from the locking arm.

28. The combination, with a desk telephone, of means for locking thereceiver hook of the telephone in its depressed position, anelectro-mechanical release for said .means, and a device for relockingsaid means after a prescribed interval of time, said device comprising arotatably mounted escape wheel, a weight controlled verge engaging theescape wheel, a rotatably mounted sheave, means whereby rotary movementmay be imparted to thevsheave both right-handedly and left-handedly,connections between the sheave and the escape wheel so that the lattermay be rotated by the sheave when moving in one direction but heldstationary when the sheave moves in the other direction, mechanism forreleasing the escape wheel and arresting its movement, and devicescarried by the sheave and cooperating with the aforesaid locking means.

29. A telephone switch lock comprising means for locking the telephoneswitch lever in one-position, means for unlocking said lever, and meansfor re-locking it after a predetermined interval.

30. A telephone switch lock comprising means for locking the telephoneswitch lever in one position', electrically operated means for.unlocking said lever, and means for relocking it after a predeterminedinterval.

31. A telephone switch lock comprising means for locking the telephoneswitch lever in one position, means for unlocking said lever, andelectrically released mechanical means for re-locking it after apredetermined interval.

32. A telephone switch lock having a switch lever engaging member, alocking device engaging the latter, dual manual means operative singlyfor releasing the said device independently of the switch lever, and anautomatic releasing and time controlled relocking mechanism therefor.

33. A telephone switch lock having means for locking the switch lever ofa telephone,

an automatic release for said means responsive to an incoming call,'-and time controlled mechanism for automatically relocking the said meansif such incoming call is not answered.

34. A telephone switch lock having means for locking the switch lever ofa telephone, a positive automatic release for said means responsive toan incoming call, and mechanism for automatically relocking the saidmeans if such incoming call is not answered within a predeterminedinterval.

35. A telephone switch lock having switch lever engaging member, alocking device for said member, a dual manual release for said device,an automatic release there for, and a time controlled automaticrelocking means for the same.

36. A telephone switch lock having means for locking the switch lever ofa telephone, a singly operable double unit release for said means, anautomatic release therefor, and a time controlled relocking mechanismfor the same. p

37. A telephone switch lock consisting of a locking member for theswitch lever of a telephone, manual unlocking means for said member, andan automatic unlocking and time-controlled relocking mechanism for thesame.

38. A telephone switch lock consisting of a locking member for theswitch lever of a telephone, an automatic releasing and relockingmechanism for said member, and

means carried by the said mechanism for varying the interval of timeoccurring between the releasing and relocking operations.

39. -A device for locking telephones comprising a locking member for theswitch lever of a telephone, a dual manual release for the memberoperable for outgoing calls, an automatic release operable on incomingcalls, and a time controlled relocking mechanism for the memberoperatively connected with the automatic release.

40. A device for locking telephones comprising a locking member for theswitch lever of a telephone, a dual manual release for the memberoperable for outgoing calls, an

automatic release operable on incoming calls, a time controlledrelocking mechanism for the member operatively connected w1th theautomatic release, and meansfor varying the intervals of timeoccurringbetween the operation of the automatic release and manuallyreleased, an automatic release for the locln'ng member, and a timecontrolled relocking mechanism for the same operatively connected withthe automatic release.

43. A device for locking telephones comprising a switch lever lockingmember, a dual manual singly operative release for the same requiringthe removal and replacement of the receiver for the relocking of themember, and an automatic'releasing and time-controlled relockingmechanism for the member, the relocking operation of which is preventedby the removal of the receiver from its hook.

- 4.1L. A device for locking telephones comprising a receiver hooklocking member, multiple releasing means therefor operativeindependently of the receiver hook, and positive means for retaining themember in unlocked position except when the receiver is on the saidhook.

45. A device for locking telephones comprising a switch lever lockingmember, an automatic release therefor, and means for operating saidrelease, the said means being responsive to incoming calls anddetachably secured to the telephone equipment for operation thereby.

A6. A telephone locking device comprising a switch lever locking member,an automatic release for the same, an automatic relocking mechanismtherefor, and means mechanically derived from the telephone equipmentand operatively connected with the automatic release and the automaticrelocking mechanism.

47. A telephone lock comprising means for locking and unlocking atelephone switch lever, and means independent of said switch lever forretaining said first means in unlocked position. 48. A telephone lockingdevice comprising a switch lever locking and unlocking mechanism, andpositive means contained in said mechanism for retaining the same inunlocked position to permit the receiver hook to be oscillated withoutrelocking.

49. A telephone locking device comprising a switch lever locking andunlocking mechanism, and means contained in said mechanism for retainingthe same in unlocked position to permit the receiver hook to beoscillated without relocking.

50. A telephone lock including a switch lever locking and unlockingdevice, and means for operative engagement by the telephone receiver forretaining the said device in unlocked position independent of thereceiver hook.

51. A telephone lock comprising means for locking and unlocking, atelephone switch lever, means independent of said switch lever forretaining said first means in unlocked position and a receivercontrolled release for said retaining means.

meaeca 52. A telephone lock having a device for locking the switch leverof the telephone in one posit-ion, releasing means for the said device,a time-controlled relocking mechanism therefor, and a switch levercontrolled energizing medium for the relocking mechanism.

53. A telephone lock having a device for locking the switch lever of atelephone in one position, an automatic releasing means for the saiddevice, a time-controlled relocking mechanism therefor, and a switchlever controlled energizing medium for the relocking mechanism.

54. A telephone lock including a switch lever locking member, a releasefor the same, a relocking mechanism therefor, and means operativelyconnecting the relocking mechanism with the said locking member forstoring energy to operate the relocking mechanism when the lockingmember is in locked position.

55. A telephone lock including a switch lever locking member, a releasefor the same, a relocking mechanism therefor, and an energizing mediumfor the relocking mechanism, the said energizing medium being renderedoperative when the locking member is in locked position but renderedinert when the said locking member is in unlocked position.

56. A telephone lock including a switch lever locking medium. a releasetherefor, means for automatically relocking the said medium at theexpiration of a predetermined interval of time after release, and anactuating device 'for said means.

57. A telephone lock including a switch lever locking medium, a releasetherefor, means for automatically relocking the said medium at theexpiration of a predetermined interval of time after release, and anactuating device for said means, the said clevice being operativelyconnected with the said locking medium.

58. A telephone lock having a switch lever locking medium, a release forthe same, a time-controlled relocking means therefor, and an actuatingdevice for the relocking means operatively connected with the lockingmedium.

59. A telephone lock having a switch lever locking medium, a release'for the same, a time-controlled relocking means therefor, and aresilient actuating device for the relocking means.

60. A telephone lock having a switch lever locking medium, a release forthe same, a time-controlled relocking means therefor, and a resilientactuating device for the relocking means, the energy of the resilientrelocking device being rendered potential when the said locking mediumis in locked position.

61. A telephone lock comprising a switch 130 lever locking means, arelease for said locktime-controlled relocking mechanism, and ing means,and a combined time-controlled means for varying the time element in thelocking and incoming call indicating mechatime-controlled mechanism. 10nism operatively connected With said lock- In testimony whereof theyaflix their sig 5 ing means. natures.

62. A telephone lock comprising a switch CHARLES BAUM.

lever locking medium, a release therefor, a EDGAR H. TALBERT.

